Download Security Update for 64-bit Windows Media Format Runtime 9.5 for Windows XP x64 Edition and Windows Server 2003 x64 Edition (KB954155) from Official Microsoft Download Center

Security Update for 64-bit Windows Media Format Runtime 9.5 for Windows XP x64 Edition and Windows Server 2003 x64 Edition (KB954155)

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A security issue has been identified that could allow an unauthenticated remote attacker to compromise your system and gain control over it.